John sherman



(No Model.)

J. S H E R M-A N Device for Threading; Bolt-s.

No. 236,365. Patented Jan. 4,1881.

ItFETERS, Puomdmocmnuzn. wAsmna'w'm o c.

o'The said disks have a central opening for set-,

UNITED STATES PATENT OFFICE.

JOHN SHERMAN, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO LEONARD H.BURT, OF SAME PLACE.

DEVICE FOR THREADING BOLTS.

SPECIFICATION forming part of Letters Patent No. 236,365, dated January4, 1881.

Applicationfiled November 4,1880. (N0 model.)

To all whom it may concern Be it known that 1, JOHN SHERMAN, ofCleveland, county of Ouyahoga, and State of Ohio, have invented certainnew and useful Improvements in Bolt-Cutter Heads, which are fully setforth in the following specification and accompanying drawings, inwhich- Figure 1 is a face view of abolt-cutter head showing myimprovements. Fig. 2 is a longitudinal section of the same in line at wof Fig. 1. Fig. 3 is a face view of one of the die-holders, having frontplate removed to show radial slots for the dies. Fig. 4 is a verticalsection of same. Fig. 5 is a detached view of the front plate.

The nature and object of these improvements will fully appear in thesubjoined description, when considered in connection with theaccompanying drawings, which object is to supply a ready, simple, andeconomical means of setting and adjusting the cuttingdies to avariety ofsizes of screw-threads without removing the dies. This I accomplish bythe use of circular revolvingly-adjustable die-holders, as hereinafterdescribed and claimed.

A is a head-block set onto a hollow shaft or spindle, B, and is providedwith a circular face-plate, O. Said block has longitudinal radial slots,in which are pivoted levers D D. The front ends of said levers have pinsd.which extend forward from theface-plate O,and upon which are placedcircular revolvingly-adjustable dieholders E E, held in place by nuts 6on said pins (1. These die-holders E consist of disks or wheels (seen inFig. 3) having radial slots, in which are set the cutting-dies F F,secured or clamped therein by the front plate, G, when screwed downfirmly in place.

ting them onto the aforesaid pins d. This central opening is enlargedfrom the front down to the depth of the slots for the purpose ofinserting a sleeve or bushing, "5, against which the inner ends of thedies F rest.

In the outer sides of the levers D are fixed spring-bolts H, which serveas guides for and means of adj usting and holding the die-holders inplace when adjusted, there being a series of holes, h, in the rear sideof said holders to receive the ends of the bolts H.

The cutting-dies F are simple straight pieces of steel, of uniform size,easily made, renewed, or replaced. Each holder is supplied with half adozen or more of these dies, numbered from 1 to 6, in accordance withthe varying sizes of thread. To adj ustthese dies for changin gfroin onesize ornuinberofth read to another it is only necessary toslightlyloosei'l the nuts 0 and slide back the bolts H, and turn theholders so as to bring the required numbers together at the center ofthe plate 0, then allow the bolts H to enter the proper holes and againturn down the nuts 0. Then the machine is ready to perform its work.

From the foregoing it will be seen that this device is readily andrapidly changeable for cutting a variety of work, requiring no greatamount of skill to operate it, and also that the cuttings all fall awayoutside of the cutter-head,

because the cutters are located outside, so that the machine is notclogged with cuttings, but readily clears itself. The bolts after beingout are released from the cutters by mechanism arranged to push back aslide-block, K, which releases the rear end of the levers. Then theholders E are expanded by springs it under the front of the levers.

Having described my invention, 1 claim- 1. The rcvolvingly-adjustabledie-holder consisting of the circular disk E, having central opening,recesses h, and radial slots for holding the cutting-dies F, the sleeve6, and front clamping-Mate, G, as described.

2. The revolvingly-adj ustable die-holders E, constructed as described,in combination with the pivoted levers D, having pin (1 and nut c,spring-bolt H, and spring k, the said levers being operated to close orexpand the dies and their holders by means of block K on the centralshaft, B, substantially as and for the purpose specified.

JOHN SHERMAN.

Witnesses:

GEO. W. Tmmrrs, G. D. OOONNOR.

